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Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Non-cash Investing and Financing Activities from Continuing Operations [Abstract]    
Property, plant and equipment acquired with accrued liabilities $ 37,168 $ 31,579
Supplemental Cash Flow Elements [Abstract]    
Interest (net of amounts capitalized) (67,119) (65,820)
Income taxes (paid) refunded $ (14,837) $ 1